Sheet-metal-pipe corrugator.



lATBNTED NOV. 3, 1903.

M. LLHUNKER.

SHEET METAL PIPE GORRUGATOR.

I APPLICATION FILE-D AUG. 16, 1901.

R0 MODEL.

m: HuRmS PETERS r0. worc-uwo \usnmorow, u c

PA'TENTED Nov. 3,1903.

M. L. HUNKER. SHEET METAL PIPE OORRUGATOR.

APPLICATION FILED AUG. 16, 1901. no MODEL. a sHnms-snnm 2.

m: ucnms PETERS co. wm'mrmmmsnmswum, c.

- No. 743,287. I PATENTED NOY. 3, 1903.

M. HUNKER. SHEET METAL PIPE GORRUGATOR.

. APPLICATION FILED AUG. 16, 1901. 30 MODEL. 3 SHEETS-SHEBT 3.

warms c0. mom-Luau, WASHINGTON a c 50 brought together.

UNiTED STATES.

Fatented Llovember 3,

PATENT Fries.

MARTIN L. HUNKER, on OA TON, OHIO, ASSIGNOR, BY MEsNE ASSIGN- MENTS, TO THE PIPE MACHINE AND MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

SHEET-METAL-PIPE CORRUGATOR.

SPECIFICATION forming part of Letters Patent No. 743,287, dated November 3, 1903.

Application filed August 16, 1901- Serial No. 72,221. (No modeLl Pipe Oorrugator, of which the following is a specification.

My invention relates to an improved machine for corrugatingsheet-metal pipes, and has for its principal objects the corrugation of pipes of any reasonable lengths, of various shapes and sizes,and either straight or curved, by merely changing the head and die which do the work or the mandrel on which the pipe may be formed or finished. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of the corrugator as applied to a pipe forming or finishing machine; Fig. 2, a vertical longitudinal section of the same, showing a pipe being corrugated; Fig. 3, a cross-section on the line 3 3 of Fig. 2. Figs. 4 are detached perspective views of a die-ball and its bearing-blocks;

Figs. 5, detached perspective views of a die-- roller and its bearing-blocks, and Figs. 6 are detached perspective views of some head-balls and their bearing-disks.

Similar numerals refer to similar parts throughout the several views.

In the adaptation of my invention as illustrated, 1 isa part of the frame of a pipe forming or finishing machine, to which is attached an ordinary mandrel 2, the forward free end of which is supported by the usual adjustable roller 3. To the forward end of the mandrel 2 is attached the corrugating-head 4 by the cap-screw or other suitable fastening. The head 4 is composed of two similar plates or disks 6, which form bearings for the headballs 7, which partially protrude from the periphery of said head. These bearings are formed by the truncated semispherical sockets 8, registering one with another, located in the respective contiguous faces of the disks 6, so that more than half of the several balls are within the periphery of the head, whereby the contracted openings 9 of the sockets will retain the balls when the disks are The sockets 8 are formed of sufficient diameter to neatly bear the balls without binding them when the disks are tightened together, so the balls when lubri cated will readily rotate in response to a moving pressure applied to their protruding faces. The corrugating-head is of such shape or diameter and the protruding faces of the balls are so located that said faces will conform to "or be slightly within the inner surface of the pipe to be corrugated, and the grooves 10 are preferably provided across the peripheries of the plates or disks 6 between the respective balls, the efiect of which grooves being to increase the protrusion of the balls with reference to the part of the head therebetween.

To the post 11, which is attached to the frame 1, is hinged the die-plate 12. This hinge connection is preferably made by the adjustable hinge-screws 13, passing through the lugs 14. on the side of said post, by which arrangement the die-collar can be readily removed and one of different shape or size substituted. In the die-plate 12 is provided the aperture 16, similar in shape and somewhat larger than the external section of the pipe to be corrugated. Around the aperture 16 on one side of the die-plate are attached the die-ball-bearing blocks 17 by means of cap-screws 18 or other form of bolts passing through the radially-slitted holes 19, located in the outer parts of said blocks, which on ables the blocks to be adjusted to or from the center of the die. The inner ends 20 of the bearing-blocks are shaped or concaved to correspond substantially with the edge of the aperture 16. Two similar blocks 17 form the bearing for each die-ball 21 by the truncated semispherical sockets 22, so located in the in ner parts of the contiguous faces of said blocks that the die-balls will protrude inwardly from the inner ends of the blocks. The sockets 22 are formed, retain the balls, and allow the same to rotate in a manner similar to the sockets 8, above described. The dieballs 21 are located so as to protrude between the head-balls 7 when the die is placed around the head as below described.

One pair of bearing-blocks 17 preferaby carries a roller 23 instead of aball, in which event the recesses 24 are provided in the respective blocks, and journal-bearings 25 are provided for the roller-shaft or axial pins 26, all being so located that the face of the roller will protrude inwardly from the inner ends of the blocks. The face of the roller 23 is shaped or concaved lengthwise to correspond with the external face of the pipe to be corrugated. Other forms and faces of rollers can be used for special purposes in a manner similar to that herein specified.

When not in use for corrugating pipe, the die-collar 15 can be swung on its hinge away from the head 4, as illustrated in Fig. 1, and the mandrel 2 used for its ordinary purpose, and the die is also swung away from the head when a pipe is being placed on the mandrel for corrugating. When it is desired to corrugate a pipe which has been formed or finished on the mandrel or has been placed thereon for that purpose, the die 15 is swung to a position around the head 4, so the respective balls and the roller are in the same plane, as illustrated in Figs. 2 and 3 and in broken lines in Fig. 4, in which position it is maintained by the contact of the arm 27 of the die-plate against the post 28, which is attached to the frame 1, where said arm is locked by the bolt 29, which is depressed by the cam-lever 30, pivoted to said post, acting against the head 31 of said bolt, and which is again raised when freed by the coil-spring 32 acting between said head and the lug 33 on the side of said post, through which lug the bolt passes. The die-collar 15, being locked in its operating position around the head 4, the sheet-metal pipe 34 is forced by mechanical or manual means forward over the head 4, where it is corrugated by the die-balls 21 bending the sheet metal inward between the head-balls 7, as illustrated in Figs. 2 and 3. As it is not desirable to bend the seam 35 of the pipe, the same is passed under the concave roller 23, which maintains the normal shape of the pipe therealong.

If it be desired to corrugate a curved pipe or an elbow, it is only necessary to substitute a curved mandrel for the straight one, as

illustrated by broken lines in Fig. 3, after which the corrugating is done the same as above described, and various sets of heads and dies are provided for the several standard sizes of pipe.

WVhile the illustrations and above description particularize the application of my invention to circular corrugations in round pipes, it is apparent that the forming or bending balls can be elongated, as cylinders having rounded or more or less squared ends or flattened, as disks with rounded or more or less angular peripheries, and in each case the bearing and retaining sockets are varied in form to suit, which variety of faces will make any desired kind of irregular or angular corrugations, and the head and die collar can be varied in shape to correspond with any desired cross-section of pipe.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a sheet-metal-pipe corrugator, a head with die-balls partially protruded from truncated spherical sockets in the periphery of the head, and a collar around the head with dieballs partially protruded from truncated spherical sockets in the opposing face of the collar, the sockets having contracted mouths and neatly embracing more than half of the respective die-balls.

2. In a sheet-metal-pipe corrugator, a head with rotatable dies partially protruded from truncated similar sockets in the periphery of the head, and a collar around the head with rotatable dies partially protruded from truncated similar sockets in the opposing face of the collar, the sockets having contracted mouths and neatly embracing more than half of the respective dies.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARTIN. L. HUNKER.

Witnesses:

THEO. F. HEIM, HARRY FREASE. 

